Amino­[(1H-benzimidazol-2-yl)amino]­methaniminium 4-methyl­benzene­sulfonate

The asymmetric unit of the title salt, C₈H₁₀N₅⁺·C₇H₇O₃S⁻, consists of two amino­[(1H-benzimidazol-2-yl)amino]­meth­an­im­inium cations and two 4-methyl­benzene­sulfonate anions. The cations are each stabilized by intra­molecular N—H...N hydrogen bonds between the free amino groups and the imine N atoms of the benzimidazole units, forming S(6) ring motifs. In the crystal, cations and anions are linked by N—H...O and C—H...O hydrogen bonds, forming a three-dimensional supra­molecular framework. Two strong π–π stacking inter­actions [centroid–centroid distances = 3.4112 (14) and 3.4104 (14) Å] also occur between the centroids of the imidazole rings of like cations.

Methyl 2-((2Z,5Z)-2-{(E)-2-[1-(4-hy­droxy­phen­yl)ethyl­idene]hydrazin-1-yl­idene}-4-oxo-3-phenyl-1,3-thia­zolidin-5-yl­idene)acetate

In the title compound, C₂₀H₁₇N₃O₄S, all non-H atoms, except those of the phenyl ring, are approximately coplanar [maximum deviation = 0.2214 (1) Å], and the dihedral angle between their best plane and the benzene ring is 53.13 (1)°. A short intra­molecular O...S contact of 2.838 (1) Å is formed between the ester carbonyl O atom and the S atom of the thia­zolidine ring. In the crystal, mol­ecules associated via O—H...O, C—H...O and C—H...S hydrogen bonds form layers parallel to (010), with only C—H...O-type short contacts between the mol­ecules in adjacent layers.

12-(2-Hy­droxy-6-oxo­cyclo­hex-1-en­yl)-9,10-di­hydro-8H-benzo[a]xanthen-11(12H)-one

In the xanthenone system of the title compound, C₂₃H₂₀O₄, the pyran ring has a maximum deviation of 0.111 (1) Å from planarity and the outer cyclo­hexene ring exhibits a puckered conformation. The three methyl­ene C atoms of the cyclo­hexene ring bonded to the pyran unit are disordered over two sets of sites [occupancies = 0.570 (3) and 0.430 (3)]. In the crystal, mol­ecules are linked by C—H...O and O—H...O hydrogen bonds, forming a two-dimensional network parallel to (110). A C—H...π inter­action occurs between these networks.

(2E)-4-(4-Bromo­phen­yl)-2-{(2Z)-[1-(4-methyl­phen­yl)ethyl­idene]hydrazinyl­idene}-3-phenyl-2,3-di­hydro-1,3-thia­zole

In the title compound, C₂₄H₂₀BrN₃S, the di­hydro­thia­zole ring is approximately planar, with a maximum deviation of 0.008 (2) Å, and is twisted with respect to the 4-bromo­phenyl ring, the phenyl ring and methyl­phenyl ring, making dihedral angles of 47.96 (8), 59.52 (9) and 16.96 (9)°, respectively. In the crystal, weak C—H...π inter­actions link inversion-related mol­ecules into supra­molecular dimers.